/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace globalVarTest {
    abstract class Animal {
        public abstract sound(): void
    }

    class Dog extends Animal {
        public sound(): void {
            console.log("woof")
        }
    }

    class Cat extends Animal {
        public sound(): void {
            console.log("meeow")
        }
    }

    const globalDog = new Dog()

    function makeSound(animal: Animal) {
        animal.sound()
    }

    function main() {
        makeSound(globalDog)
        let newDog = new Dog()
        makeSound(newDog)
    }
}